启用 unityweb 文件自动缓存功能。
设置为 true 时，这种情况下会自动缓存用户计算机上的内容 unityweb 文件，这样就不必在后续运行中重新下载。缓存是使用浏览器提供的 IndexedDB API 实现的。有些浏览器可能会对此实施限制，例如要求用户进行授权才能缓存超过特定大小的数据。
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